Sampling rate vs. max USB rate

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harry4516
Posts: 1
Joined: Mon Sep 09, 2019 8:23 pm

Sampling rate vs. max USB rate

Post by harry4516 » Mon Sep 09, 2019 8:30 pm

I have a question regarding the sampling rate.
The SDRplay is specified with max 10 MS/s. With 14 bit for each sample and twice of that for I and Q.
This is a data rate of 10 * 14 * 2 = 280 Mbit/s

But the USB 2.0 interface can only transfer 40 Mbit/s maximum.

That looks strange, what is the mistake in my calculation ?

Thanks, Harry
Last edited by harry4516 on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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g1hbe
Posts: 493
Joined: Sat Jan 17, 2015 3:28 pm
Location: Cheshire, UK

Re: Sampling rate vs. max USB rate

Post by g1hbe » Tue Sep 10, 2019 7:30 am

I'm no expert in matters digital, but I think at 10 Ms/s, the samples are reduced to 8 bit. I could be wrong (I often am...).
Last edited by g1hbe on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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Andy

OH2BUA
Posts: 83
Joined: Mon Aug 29, 2016 8:58 am

Re: Sampling rate vs. max USB rate

Post by OH2BUA » Tue Sep 10, 2019 10:06 am

harry4516 wrote:
Mon Sep 09, 2019 8:30 pm
But the USB 2.0 interface can only transfer 40 Mbit/s maximum.
40 megabytes, not megabits.
Last edited by OH2BUA on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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